Help! Repeating sequence of Snow Leopard woes! Boot freezes, airport errors

Okay. I seem to be experiencing a cocktail of problems on my MacBook Pro that are similar to those individually reported in other threads. Apologies if this is covered elsewhere, but I've searched and haven't so far found a thread that replicates all my problems exactly and in the same way …
So here goes.
I am on my 3rd install of Snow Leopard. First time I updated from Leopard; second time I erased and installed, then restored from Time Machine; third (most recent) time I erased and installed and have not restored anything except my files from Time Machine.
I'm on a new MBP (2.8GHz, 4GB memory, bought new in Aug/Sept)
Each time I've reinstalled, I've experienced a few trouble-free days in which I think: Ah! Finally fixed it. Then the problems start to creep back in. They are:
1. airport starts to turn itself off. Its icon will be there in the bar, but as an empty triangle. Turning it on will not work (nor will going into preferences, edit locations solution proposed elsewhere). This initially only ever happens when booted from cold. A simple restart will solve the problem.
2. airport icon disappears from bar altogether. Again, only when booted from cold. But sometimes 2-3 restarts required before it will return.
3. system starts to hang halfway through booting from cold or occasionally on a warm restart. It will do the chime, get to the logo and progress indicator, then the indicator will freeze after a short while of spinning and there it will stay. Power off and restart required to get past this stage.
4. (Haven't yet reached this stage on my current reinstall, but happened on the others) After repeated instances of (3) which get more and more frequent, bootup will progress to a blue screen with a progress indicator. Periodically, this screen will refresh and the shade of blue will change; but the system will never get past this stage, not even on a Safe mode startup.
Once I reach stage 4, I cannot get back into my Mac, and will have to use the disc to reinstall. And the cycle returns to step 1.
As you can imagine, I'm getting a little tired of this process. That Apple startup chime is getting mighty tiresome. Is anybody experiencing this grim Sisyphean torment, or is it just me?

Download and run Rember which does more extensive testing. I don't use wifi, so have nothing to say WRT your airport issues. Have a bootable backup/clone? If so, boot with it and see if the problem's still there. It's possible that there's something wrong with the hardware, even though it passes the AHT tests, and you might talk to AppleCare.

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